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Moderate Prenatal Alcohol Exposure and Quantification of Social Behavior in Adult Rats
Published on: December 14, 2014
Prenatal cocaine exposure alters alpha2 receptor expression in adolescent rats
Rosemarie M Booze1, David R Wallace, Janelle M Silvers
1Department of Psychology, University of South Carolina Columbia, SC 29208, USA. booze@sc.edu
Insights
Prenatal cocaine exposure alters norepinephrine systems in adolescent rats, affecting alpha2-adrenergic receptors in key brain regions. These changes may explain persistent attentional deficits in offspring.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Psychology
Background:
- Prenatal cocaine exposure is linked to persistent attentional deficits in early childhood.
- Norepinephrine (NE) systems play a crucial role in regulating attentional processes.
- Understanding the neurobiological impact of prenatal cocaine exposure is vital for addressing developmental abnormalities.
Purpose of the Study:
- To investigate the long-term effects of prenatal cocaine exposure on forebrain norepinephrine (NE) systems in adolescent rats.
- To quantify changes in alpha2-adrenergic receptor (alpha2-AR) density following in-utero cocaine administration.
Main Methods:
- Cocaine was administered intravenously to pregnant rats, mimicking clinical exposure.
- Alpha2-adrenergic receptor (alpha2-AR) density was measured in adolescent offspring (35-days-old) using [3H]RX821002 radioligand binding.
- Specific brain regions examined included the hippocampus, amygdala, and parietal cortex.
Main Results:
- Sex-specific alterations in alpha2-AR density were observed in the hippocampus and amygdala of cocaine-exposed rats.
- An upregulation of alpha2-AR density was found in the parietal cortex of offspring exposed to cocaine prenatally.
- These findings indicate persistent, region-specific neurochemical changes in the NE system.
Conclusions:
- Prenatal cocaine exposure induces lasting alterations in forebrain norepinephrine systems, evidenced by modified alpha2-AR density.
- These neurochemical alterations may underlie the observed behavioral deficits in attention among offspring.
- The study highlights the vulnerability of developing NE systems to gestational drug exposure.
Background:
Prenatal cocaine exposure produces attentional deficits which to persist through early childhood. Given the role of norepinephrine (NE) in attentional processes, we examined the forebrain NE systems from prenatal cocaine exposed rats. Cocaine was administered during pregnancy via the clinically relevant intravenous route of administration. Specifically, we measured alpha2-adrenergic receptor (alpha2-AR) density in adolescent (35-days-old) rats, using [3H]RX821002 (5 nM).
Results:
Sex-specific alterations of alpha2-AR were found in the hippocampus and amygdala of the cocaine-exposed animals, as well as an upregulation of alpha2-AR in parietal cortex.
Conclusion:
These data suggest that prenatal cocaine exposure results in a persistent alteration in forebrain NE systems as indicated by alterations in receptor density. These neurochemical changes may underlie behavioral abnormalities observed in offspring attentional processes following prenatal exposure to cocaine.
